diff --git a/packages/ai/src/providers/openai-responses-shared.ts b/packages/ai/src/providers/openai-responses-shared.ts
index c8e98fce..01c01d4c 100644
--- a/packages/ai/src/providers/openai-responses-shared.ts
+++ b/packages/ai/src/providers/openai-responses-shared.ts
@@ -173,6 +173,7 @@ export function convertResponsesMessages<TApi extends Api>(
 
 			for (const block of msg.content) {
 				if (block.type === "thinking") {
+					if (block.thinking.trim().length === 0) continue;
 					if (block.thinkingSignature) {
 						const reasoningItem = JSON.parse(block.thinkingSignature) as ResponseReasoningItem;
 						output.push(reasoningItem);